16.0 ANALOG-TO-DIGITAL
CONVERTER (ADC) MODULE
The Analog-to-Digital Converter (ADC) allows
conversion of an analog input signal to a 10-bit binary
representation of that signal. This device uses analog
inputs, which are multiplexed into a single sample and
hold circuit. The output of the sample and hold is
connected to the input of the converter. The converter
generates a 10-bit binary result via successive
approximation and stores the conversion result into the
ADC result registers (ADRESH:ADRESL register pair).
Figure 16-1 shows the block diagram of the ADC.
The ADC voltage reference is software selectable to be
either internally generated or externally supplied.
FIGURE 16-1:
ADC BLOCK DIAGRAM
PIC12(L)F1840
The ADC can generate an interrupt upon completion of
a conversion. This interrupt can be used to wake-up the
device from Sleep.
AN0
AN1
AN2
AN3
Temp Indicator
DAC_output
FVR Buffer1
VDD
ADPREF = 00
ADPREF = 11
VREF ADPREF = 10
00000
00001
00010
00011
11101
11110
11111
CHS<4:0>
GO/DONE
Ref+ Ref-
ADC
ADON(1)
VSS
10
ADFM
0 = Left Justify
1 = Right Justify
16
ADRESH ADRESL
Note 1: When ADON = 0, all multiplexer inputs are disconnected.
2011-2012 Microchip Technology Inc.
DS41441C-page 119